Feature Request: Use windows Jobs

[gerardog]

As discussed in #186

1. Using Windows Job Objects
   A Job allows to group several processes as a unit. If gsudo is groupped with the elevated process, if you kill gsudo that would kill the child process. The problem would be, who creates the job? probably gsudo should. Probably other processes won't be able to create the job without elevating first.

Let's create a windows job connecting the client gsudo with the elevated process. That way if the caller gsudo dies, the elevated process does too.